CN115088304A - Cell switching method and device - Google Patents

Cell switching method and device Download PDF

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Publication number
CN115088304A
CN115088304A CN202080095901.7A CN202080095901A CN115088304A CN 115088304 A CN115088304 A CN 115088304A CN 202080095901 A CN202080095901 A CN 202080095901A CN 115088304 A CN115088304 A CN 115088304A
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China
Prior art keywords
network device
network
terminal
equipment
neighbor cell
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CN202080095901.7A
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Chinese (zh)
Inventor
冯玺宝
李振宇
韩金侠
李志军
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of CN115088304A publication Critical patent/CN115088304A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • H04W36/083Reselecting an access point wherein at least one of the access points is a moving node
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Abstract

The embodiment of the application provides a cell switching method and a device, wherein a first network device makes a cell switching decision and sends information for link authentication to a second network device and a terminal device, the first network device sends a second switching command to the terminal device and receives a response for indicating that the terminal device is ready for switching from the terminal device, the first network device sends a state switching command to the second network device, the second network device sends a first message for indicating that the link authentication is successful to the terminal device according to the state switching command, and the terminal device is associated with the second network device. The first network equipment is used for judging cell switching, ping-pong switching can be avoided, authentication information used for link authentication is generated by the first network equipment and is sent to the second network equipment and the terminal equipment, air interface signaling for sending the authentication information to the second network equipment by the terminal equipment is saved, and air interface time delay during switching is further shortened.

Description

Cell switching method and device Technical Field
The present application relates to communications technologies, and in particular, to a cell switching method and apparatus.
Background
With the rapid development of communication technology, Wireless Local Area Networks (WLANs) have been widely used, such as wireless fidelity (WIFI) technology. WIFI belongs to a short-distance wireless communication technology, and a coverage area of an access point (access point) in a WIFI system is small, so that a terminal (STA) in the WIFI system often performs a roaming operation.
Roaming refers to the handoff of a STA in a WLAN from one AP to another AP, and the roaming STA can still communicate normally. In the prior art, generally, the STA performs switching based on a decision, for example, the STA measures the signal quality of the current serving AP, when the STA detects that the signal quality of the current serving AP is weakened (a specific trigger condition may be decided by the STA), the STA may send a neighbor list request to the current serving AP, the current serving AP feeds back the neighbor list, and the STA selects an AP as a target AP to perform switching from the neighbor list fed back by the current serving AP.
On one hand, the switching judgment by the STA is easy to generate ping-pong switching effect; on the other hand, the existing handover procedure causes a large handover delay.
Disclosure of Invention
The embodiment of the application provides a cell switching method and a cell switching device, which reduce the switching time delay of an STA and ensure that the STA is quickly switched from a source cell to a target cell.
A first aspect of the present application provides a cell handover method, including: the first network equipment determines to switch the accessed terminal equipment to second network equipment, and the coverage area of the second network equipment is the adjacent area of the coverage area of the first network equipment. The method comprises the steps that a first network device sends capability information and first authentication information of a terminal device to a second network device, the first authentication information is used for link authentication of the terminal device by the second network device, the first network device receives access permission information from the second network device, when the access permission information is used for indicating that the terminal device is allowed to access the second network device, the first network device sends a second switching command to the terminal device, the second switching command is used for indicating that the terminal device is switched to the second network device, and the second switching command comprises second authentication information. The first network device receives a second switching command response from the terminal device, the second switching command response is used for indicating that the terminal device is ready for switching, the first network device sends a state switching command to the second network device, and the state switching command is used for indicating that the terminal device is ready for switching.
In the method, the first network equipment judges the cell switching, so ping-pong switching can be avoided, the first network equipment generates authentication information for link authentication and sends the authentication information to the second network equipment and the terminal equipment, thereby saving an air interface signaling for the terminal equipment to send the authentication information to the second network equipment and further shortening air interface time delay during switching.
In one exemplary approach, the first authentication information includes an authentication nonce, the authentication nonce being generated by the first network device.
In an exemplary manner, the second authentication information includes the authentication random number, wherein the random number included in the first authentication information is the same as the random number included in the second authentication information.
In an exemplary manner, the sending, by the first network device, the capability information of the terminal device and the first authentication information to the second network device includes: and the first network equipment sends a first switching command to the second network equipment, wherein the first switching command comprises the capability information and the first authentication information of the terminal equipment. The first network device receiving access permission information from the second network device, including: the first network device receives a first switching command response from the second network device, wherein the first switching command response comprises the access permission information.
In an exemplary manner, after the terminal device accesses the second network device, the method further includes:
the first network equipment receives a path switching command from the second network equipment, wherein the path switching command is used for indicating the terminal equipment to update the routing information;
and the first network equipment sends a path switching command response to the second network equipment, wherein the path switching command response is used for indicating that the route information is updated successfully or unsuccessfully.
In an exemplary manner, after the first network device sends the second handover command to the terminal device, the method further includes: and the first network equipment and the second network equipment perform data forwarding of the terminal equipment.
The first network device sends the downlink data which is not sent to the terminal device to the second network device through data forwarding, and after the terminal device is switched to the second network device, the second network device can send the downlink data to the terminal device, so that the downlink data of the STA in the switching process can not be lost.
In an exemplary manner, before the first network device determines to handover the accessed terminal device to the second network device, the method further includes:
the first network equipment receives a neighbor cell measurement result of the first network equipment from the terminal equipment;
the determining, by the first network device, to switch the accessed terminal device to the second network device includes:
and the first network equipment determines to switch the terminal equipment to the second network equipment according to the neighbor cell measurement result.
A second aspect of the present application provides a cell handover method, including: the method comprises the steps that a second network device receives capability information and first authentication information of a terminal device from a first network device, the terminal device is accessed to the first network device, the first authentication information is used for the second network device to carry out link authentication on the terminal device, the second network device sends access permission information to the first network device, and the access permission information is used for indicating that the terminal device is allowed to be accessed to the second network device. The second network device receives a state transition command from the first network device, the state transition command is used for indicating that the terminal device is ready for switching, the second network device sends a first message to the terminal device, the first message is used for indicating that the link authentication between the second network device and the terminal device is successful, and the second network device is associated with the terminal device.
Compared with the switching method in the prior art, the method saves the air interface signaling of the terminal equipment for sending the authentication information to the second network equipment, thereby reducing the cell switching delay.
In an exemplary manner, the associating the second network device with the terminal device includes: and the second network equipment receives a re-association request from the terminal equipment, and sends a re-association response to the terminal equipment.
In one exemplary approach, the first authentication information includes an authentication nonce, the authentication nonce being generated by the first network device.
In an exemplary manner, the second network device receiving the capability information and the first authentication information of the terminal device from the first network device includes: the second network device receives a switching request from the first network device, wherein the switching request comprises the capability information of the terminal device and the first authentication information. The second network device sending access permission information to the first network device, including: and the second network equipment sends a switching request response to the first network equipment, wherein the switching request response comprises the access permission information.
In an exemplary manner, the first message is an authentication response or a fast transition action response.
In an exemplary manner, after the second network device is associated with the terminal device, the method further includes:
the second network equipment sends a path switching command to the first network equipment, wherein the path switching command is used for indicating the terminal equipment to update the routing information;
the second network device receives a path switching command response from the first network device, wherein the path switching command response is used for indicating that the route information is updated successfully or unsuccessfully.
In an exemplary manner, after the second network device sends the access permission information to the first network device, the method further includes: and the second network equipment and the first network equipment carry out data forwarding of the terminal equipment.
A third aspect of the present application provides a cell handover method, including: the terminal device receives a second switching command from a first network device, the second switching command is used for indicating the terminal device to be switched to a second network device, the second switching command comprises second authentication information, the terminal device sends a second switching command response to the first network device, the second switching command response is used for indicating that the terminal device is ready for switching, the terminal device receives a first message sent by the second network device, the first message is used for indicating that the link authentication between the second network device and the terminal device is successful, and the terminal device is associated with the second network device in response to the first message.
In the method, the first network equipment judges the cell switching, so ping-pong switching can be avoided, the first network equipment generates authentication information for link authentication and sends the authentication information to the second network equipment and the terminal equipment, so that an air interface signaling for the terminal equipment to send the authentication information to the second network equipment is saved, and air interface delay during switching is shortened.
In an exemplary manner, the associating the terminal device with the second network device includes:
the terminal equipment sends an association request to the second network equipment;
the terminal device receives an association response from the second network device.
In an exemplary manner, the first message is an authentication response or a fast transition action response.
In an exemplary manner, before the terminal device receives the second handover command from the first network device, the method further includes:
the terminal equipment carries out neighbor cell measurement according to the neighbor cell measurement configuration;
and the terminal equipment sends the neighbor cell measurement result to the first network equipment.
In an exemplary manner, the method further comprises:
and the terminal equipment receives the neighbor cell measurement configuration from the first network equipment, wherein the neighbor cell measurement configuration is used for configuring the neighbor cell of the first network equipment and the measurement resource of the neighbor cell.
In an exemplary manner, the sending, by the terminal device, a neighboring cell measurement result to the first network device includes:
and the terminal equipment sends a wireless measurement action frame to the first network equipment, wherein the wireless measurement action frame comprises the neighbor cell measurement reporting field, and the neighbor cell measurement result is carried in the neighbor cell measurement reporting field.
In an exemplary manner, the receiving, by the terminal device, the neighboring cell measurement configuration from the first network device includes:
and the terminal equipment receives an association response or a re-association response from the first network equipment, wherein the association response or the re-association response comprises the neighbor cell measurement configuration.
In an exemplary manner, the association response or the re-association response includes a provider specific domain, and the neighbor cell measurement configuration is carried in the provider specific domain.
In an exemplary manner, the method further comprises:
and the terminal equipment receives neighbor cell measurement updating information from the first network equipment, wherein the neighbor cell measurement updating information is used for updating the neighbor cell of the first network equipment.
In an exemplary manner, the receiving, by the terminal device, neighbor cell measurement update information from the first network device includes:
the terminal device receives a wireless measurement request frame from the first network device, wherein the wireless measurement request frame comprises a neighbor cell measurement update field, and the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
In an exemplary manner, the radio measurement request frame further includes a neighbor cell measurement stop field, where the neighbor cell measurement stop field carries neighbor cell measurement stop information, and the neighbor cell measurement stop information is used to indicate that measurement of a neighbor cell is stopped.
A fourth aspect of the present application provides a first network device, comprising:
the terminal equipment switching module is used for switching the terminal equipment from the first network equipment to the second network equipment;
a sending module, configured to send, to the second network device, capability information of the terminal device and first authentication information, where the first authentication information is used for performing link authentication on the terminal device by the second network device;
a receiving module, configured to receive access permission information from the second network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device;
the sending module is further configured to send a second handover command to the terminal device, where the second handover command is used to instruct the terminal device to switch to the second network device, and the second handover command includes second authentication information;
the receiving module is further configured to receive a second handover command response from the terminal device, where the second handover command response is used to indicate that the terminal device is ready for handover;
the sending module is further configured to send a state transition command to the second network device, where the state transition command is used to indicate that the terminal device is ready for handover.
In one exemplary approach, the first authentication information includes an authentication nonce, the authentication nonce being generated by the first network device.
In an exemplary manner, the second authentication information includes the authentication nonce.
In an exemplary manner, the sending module sends the capability information of the terminal device and the first authentication information to the second network device, including:
sending a first switching command to the second network equipment, wherein the first switching command comprises the capability information and the first authentication information of the terminal equipment;
the receiving module receives access permission information from the second network device, including:
receiving a first handover command response from the second network device, the first handover command response including the access permission information.
In an exemplary manner, the receiving module is further configured to receive a path switching command from the second network device after the terminal device accesses the second network device, where the path switching command is used to instruct the terminal device to update the routing information;
the sending module is further configured to send a path switching command response to the second network device, where the path switching command response is used to indicate that the routing information update is successful or failed.
In an exemplary manner, the method further comprises:
and the data forwarding module is used for performing data forwarding of the terminal equipment with the second network equipment.
In an exemplary manner, the receiving module is further configured to: receiving a neighbor cell measurement result of the first network device from the terminal device;
the determining module is specifically configured to: and determining to switch the terminal equipment to the second network equipment according to the neighbor cell measurement result.
A fifth aspect of the present application provides a second network device, comprising:
a receiving module, configured to receive, from a first network device, capability information of a terminal device and first authentication information, where the terminal device has access to the first network device, and the first authentication information is used for performing link authentication on the terminal device by a second network device;
a sending module, configured to send access permission information to the first network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device;
the receiving module is further configured to receive a state transition command from the first network device, where the state transition command is used to indicate that the terminal device is ready for handover;
the sending module is further configured to send a first message to the terminal device, where the first message is used to indicate that the link authentication between the second network device and the terminal device is successful;
and the association module is used for associating the second network equipment with the terminal equipment.
In an exemplary manner, the association module is specifically configured to:
receiving a re-association request from the terminal device;
and sending a re-association response to the terminal equipment.
In one exemplary approach, the first authentication information includes an authentication nonce, the authentication nonce being generated by the first network device.
In an exemplary manner, the receiving module receives capability information and first authentication information of a terminal device from a first network device, and includes:
receiving a handover request from the first network device, wherein the handover request comprises the capability information of the terminal device and the first authentication information;
the sending module sends access permission information to the first network device, including:
and sending a switching request response to the first network equipment, wherein the switching request response comprises the access permission information.
In an exemplary manner, the first message is an authentication response or a fast transition action response.
In an exemplary manner, the sending module is further configured to send a path switching command to the first network device after the second network device is associated with the terminal device, where the path switching command is used to instruct the terminal device to update the routing information;
the receiving module is further configured to receive a path switching command response from the first network device, where the path switching command response is used to indicate that the routing information update is successful or failed.
In an exemplary manner, the method further comprises:
and the data forwarding module is used for performing data forwarding of the terminal equipment with the first network equipment.
A sixth aspect of the present application provides a terminal device, including:
a receiving module, configured to receive a second handover command from a first network device, where the second handover command is used to instruct the terminal device to switch to a second network device, and the second handover command includes second authentication information;
a sending module, configured to send a second handover command response to the first network device, where the second handover command response is used to indicate that the terminal device is ready for handover;
the receiving module is further configured to receive a first message sent by the second network device, where the first message is used to indicate that the link authentication between the second network device and the terminal device is successful;
an association module for associating the terminal device with the second network device in response to the first message.
In an exemplary manner, the association module is specifically configured to:
sending an association request to the second network device;
receiving an association response from the second network device.
In an exemplary manner, the first message is an authentication response or a fast transition action response.
In an exemplary manner, the method further comprises:
the measurement module is used for carrying out neighbor cell measurement according to the neighbor cell measurement configuration;
the sending module is further configured to send a neighboring cell measurement result to the first network device.
In an exemplary manner, the receiving module is further configured to:
receiving the neighbor cell measurement configuration from the first network device, where the neighbor cell measurement configuration is used to configure a neighbor cell of the first network device and measurement resources of the neighbor cell.
In an exemplary manner, the sending module sends the neighbor cell measurement result to the first network device, including:
and sending a wireless measurement action frame to the first network equipment, wherein the wireless measurement action frame comprises the neighbor cell measurement reporting field, and the neighbor cell measurement result is carried in the neighbor cell measurement reporting field.
In an exemplary manner, the receiving module receives the neighbor cell measurement configuration from the first network device, including:
receiving an association response or a re-association response from the first network device, where the association response or the re-association response includes the neighbor cell measurement configuration.
In an exemplary manner, the association response or the re-association response includes a provider specific domain, and the neighbor cell measurement configuration is carried in the provider specific domain.
In an exemplary manner, the receiving module is further configured to:
and the terminal equipment receives neighbor cell measurement updating information from the first network equipment, wherein the neighbor cell measurement updating information is used for updating the neighbor cell of the first network equipment.
In an exemplary manner, the receiving module receives neighbor cell measurement update information from the first network device, including:
and receiving a wireless measurement request frame from the first network equipment, wherein the wireless measurement request frame comprises a neighbor cell measurement update field, and the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
In an exemplary manner, the radio measurement request frame further includes a neighbor cell measurement stop field, where the neighbor cell measurement stop field carries neighbor cell measurement stop information, and the neighbor cell measurement stop information is used to indicate that measurement of a neighbor cell is stopped.
A seventh aspect of the present application provides a network device, comprising a processor, a memory and a transceiver, the memory being configured to store instructions, the transceiver being configured to communicate with other devices, and the processor being configured to execute the instructions stored in the memory to cause the network device to perform the method according to the first aspect and various exemplary embodiments of the present application.
An eighth aspect of the present application provides a network device, comprising a processor, a memory and a transceiver, the memory being configured to store instructions, the transceiver being configured to communicate with other devices, and the processor being configured to execute the instructions stored in the memory to cause the network device to perform the method according to the second aspect of the present application and in various exemplary ways.
A ninth aspect of the present application provides a terminal device comprising a processor, a memory for storing instructions, and a transceiver for communicating with other devices, the processor being configured to execute the instructions stored in the memory to cause the terminal device to perform the method according to the third aspect of the present application and various exemplary manners.
A tenth aspect of the present application provides a computer-readable storage medium having stored thereon instructions that, when executed, cause a computer to perform the method according to the first aspect of the present application and the respective exemplary methods.
An eleventh aspect of the present application provides a computer-readable storage medium storing instructions that, when executed, cause a computer to perform a method as set forth in the second aspect of the present application and in various exemplary manners.
A twelfth aspect of the present application provides a computer-readable storage medium having stored thereon instructions that, when executed, cause a computer to perform the method according to the third aspect of the present application and the respective exemplary methods.
A thirteenth aspect of the present application provides a computer program product comprising instructions that, when executed, cause a computer to perform the method according to the first aspect and the exemplary embodiments.
A fourteenth aspect of the present application provides a computer program product comprising instructions that, when executed, cause a computer to perform the method according to the second aspect and the exemplary embodiments.
A fifteenth aspect of the present application provides a computer program product comprising instructions that, when executed, cause a computer to perform the method according to the third aspect and the respective exemplary methods.
A sixteenth aspect of the present application provides a system-on-chip or a system-on-chip, where the system-on-chip or the system-on-chip is applicable to a first network device, and the system-on-chip or the system-on-chip includes: the communication interface, the memory and the processor are interconnected through a bus, and the processor executes instructions stored in the memory to enable the first network device to execute the method according to the first aspect and the exemplary modes.
A seventeenth aspect of the present application provides a system-on-chip or a system-on-chip, where the system-on-chip or the system-on-chip is applicable to a second network device, and the system-on-chip or the system-on-chip includes: at least one communication interface, at least one processor, at least one memory, the communication interface, the memory and the processor being interconnected by a bus, the processor causing the second network device to perform the method according to the second aspect and exemplary aspects of the present application by executing instructions stored in the memory.
An eighteenth aspect of the present application provides a system-on-chip or a system-on-chip, where the system-on-chip or the system-on-chip is applicable to a terminal device, and the system-on-chip or the system-on-chip includes: the communication interface, the memory and the processor are interconnected through a bus, and the processor causes the terminal device to execute the method according to the third aspect and the exemplary modes of the application by executing the instructions stored in the memory.
A nineteenth aspect of the present application provides a communication system comprising a first network device configured to perform the method according to the first aspect and the exemplary aspects of the present application, a second network device configured to perform the method according to the second aspect and the exemplary aspects of the present application, and a terminal device configured to perform the method according to the third aspect and the exemplary aspects of the present application.
In the cell switching method and apparatus provided in the embodiment of the present application, a first network device determines to switch an accessed terminal device to a second network device, the second network device is a neighboring cell of the first network device, the first network device sends capability information of the terminal device and first authentication information to the second network device, the first authentication information is used for the second network device to perform link authentication on the terminal device, the first network device receives access permission information from the second network device, the access permission information is used to indicate that the terminal device is allowed to access the second network device, the first network device sends a second switching command to the terminal device and receives a second switching command response from the terminal device, when the second switching command response indicates that the terminal device is ready for switching, the first network device sends a state transition command to the second network device, the second network device sends a first message to the terminal device according to the state transition command, the first message indicates that the link authentication between the second network equipment and the terminal equipment is successful, and the terminal equipment is associated with the second network equipment, so that the cell switching is completed. In this way, the first network device performs cell handover decision, so that ping-pong handover can be avoided, and the first network device, as a proxy of the terminal device, can generate authentication information for link authentication and send the authentication information to the second network device and the terminal device, thereby saving an air interface signaling for the terminal device to send the authentication information to the second network device, and further shortening air interface delay during handover.
Drawings
Fig. 1 is a schematic diagram of a communication system to which the embodiment of the present application is applicable;
FIG. 2 is a diagram illustrating a process of accessing an AP by an STA;
FIG. 3 is a schematic diagram of a process of cell handover;
FIG. 4 is another flow chart illustrating cell handover;
fig. 5 is a flowchart of a cell handover method according to an embodiment of the present application;
fig. 6 is a signaling flowchart of a cell switching method according to a second embodiment of the present application;
FIG. 7 is a schematic diagram of vendor specific content;
FIG. 8 is a diagram of a neighbor cell measurement report field;
FIG. 9 is a diagram illustrating a Radio Measurement Request frame structure;
fig. 10 is a signaling flowchart of a cell handover method according to a third embodiment of the present application;
fig. 11 is a schematic structural diagram of a first network device according to a fourth embodiment of the present application;
fig. 12 is a schematic structural diagram of a second network device according to a fifth embodiment of the present application;
fig. 13 is a schematic structural diagram of a terminal device according to a sixth embodiment of the present application;
fig. 14 is a schematic structural diagram of a first network device according to a seventh embodiment of the present application.
Detailed Description
In order to make the purpose, technical solution and effect of the present application more clear, embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a communication system to which the embodiment of the present invention is applicable, and as shown in fig. 1, the communication system 100 includes: a first network device 10, a second network device 20, and a third network device 30, where the oval areas represent the coverage or service areas of the network devices, each network device having access to one or more terminal devices, and the network devices being able to communicate with the terminal devices located within the coverage area. It is understood that the communication system 100 may include more network devices and each network device may include other numbers of terminal devices within the coverage area, which is not limited in the embodiments of the present application.
In the example shown in fig. 1, three network devices are distributed at different locations, a coverage area of the first network device 10 and a coverage area of the second network device 20 have an overlapping area, the coverage areas of the first network device 10 and the second network device 20 are also referred to as a cell (cell), the first network device 10 and the second network device 20 are adjacent cells (i.e., neighboring cells), the coverage area of the second network device 20 and a coverage area of the third network device 30 have an overlapping area, and the second network device 20 and the third network device 30 are adjacent cells.
Fig. 1 is only an example, and in an actual network deployment, one cell may have one neighboring cell or may have multiple neighboring cells.
The communication system 100 may be a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, an advanced long term evolution (LTE-a) system, a New Radio (NR) system, an evolution system of an NR system, an evolution system of an unlicensed band (LTE-to-unlicensed band) system, an LTE-to-unlicensed band (NR) system, an LTE-to-unlicensed band (LTE-to-unlicensed band) system, an unlicensed band (NR) system, UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, Wireless Local Area Network (WLAN), wireless fidelity (WiFi), next generation communication system, or other communication system. Alternatively, the NR system may also be referred to as a 5G system or a 5G network.
Generally, conventional communication systems support a limited number of connections and are easy to implement, however, with the development of communication technologies, mobile communication systems will support not only conventional communications, but also, for example, device to device (D2D) communications, machine to machine (M2M) communications, Machine Type Communications (MTC), and vehicle to vehicle (V2V) communications, and the embodiments of the present application can also be applied to these communication systems.
Alternatively, the Network device 110 may be a Base Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a Network device in a Mobile switching center, a relay, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network-side device in a 5G Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.
When the communication system is AN NR system, the network device 110 may be a (radio access network (R) AN device in the NR system, and the (R) AN device in the NR system may be: non-3 GPP access networks such as Access Points (APs) of a WiFi network, next generation base stations (which may be collectively referred to as a new generation radio access network node (NG-RAN node), where the next generation base stations include a new air interface base station (NR node b, gNB), a new generation evolved base station (NG-eNB), a Central Unit (CU), a Distributed Unit (DU), a split-form gNB, and the like), new radio controllers (NR controllers), radio remote modules, micro base stations, relays (relays), transceiving points (TRPs), Transmission Points (TPs), or other nodes.
The embodiments of the present application do not limit the specific technologies and the specific device forms used by the network devices. For convenience of description, in all embodiments of the present application, the above-mentioned apparatus for providing a wireless communication function for a terminal device is collectively referred to as a network device.
In the embodiment of the present application, the terminal device 120 may be any terminal, for example, the terminal device 120 may be a user equipment for machine type communication. The terminal device 120 may also be referred to as a User Equipment (UE), a Mobile Station (MS), a mobile terminal (mobile terminal), a terminal (terminal), etc.
The terminal device 120 may communicate with one or more core networks via a RAN, and thus, the terminal device 120 may also be referred to as a wireless terminal, which may be a device that provides voice and/or data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem.
For example, the terminal device 120 may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having wireless communication capability, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, or a wearable device, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application are not particularly limited.
As another example, end devices 120 include, but are not limited to, connections via wireline, such as Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., to a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter; and/or means of another terminal device arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal device arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communications System (PCS) terminals that may combine a cellular radiotelephone with data processing, facsimile and data Communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver.
Alternatively, network device 110 and terminal device 120 may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; can also be deployed on the water surface; it may also be deployed on airborne airplanes, balloons and satellite vehicles. The embodiments of the present application do not limit application scenarios of the network device 110 and the terminal device 120.
Optionally, the network device 110 and the terminal device 120 may communicate through a licensed spectrum (licensed spectrum), may communicate through an unlicensed spectrum (unlicensed spectrum), or may communicate through both the licensed spectrum and the unlicensed spectrum.
Taking the WIFI system as an example, the network device 110 is an AP, and the terminal device 120 is an STA. The APs adjacent to each other are controlled by the same Access Controller (AC), and the Service Set Identifiers (SSIDs) are the same. The STA may roam between adjacent cells, i.e., switch from one AP to another AP.
The AP initially accessed by the STA needs to go through the following procedures: a scanning procedure, a link authentication procedure and an association procedure. Fig. 2 is a schematic diagram of a process in which an STA accesses an AP, and as shown in fig. 2, a scanning process is used for the STA to discover a wireless network, and the STA may actively scan through a Probe Request message or passively scan through a Beacon frame Beacon. The link authentication process is used for authenticating a wireless link between the STA and the AP, and the STA authenticated by the link is qualified to establish the wireless link with the AP. After the STA is qualified to establish the wireless link with the AP, service parameters of the wireless link are negotiated with the AP through an association process, and the establishment of the wireless link is completed. After the association is completed, the wireless link is established between the STA and the AP, and if the access authentication is not configured, the STA can normally access the wireless network after obtaining the IP address. If the access authentication is configured, the STA needs to complete the access authentication, key negotiation, and other stages to access the wireless network.
After the STA accesses the AP, the AP may normally provide service for the STA, so the AP is also referred to as a serving AP or serving cell of the STA, and the STA may be referred to as an access ATA of the AP or an associated STA.
In the existing scheme, when an STA needs to perform cell switching, the STA measures the signal quality of a current serving AP, and when it is detected that the channel quality of the serving AP is weakened (a specific trigger condition may be decided by the STA), the STA sends a neighbor list request to the serving AP, the serving AP feeds back a neighbor list with the same SSID to the STA, and the STA selects an AP from the neighbor list fed back by the AP as a target AP to perform cell switching.
In the protocol 802.11r, Fast Basic Service Set (BSS) Transition (FT for short) is supported between the STA and the AP, and two switching flows, i.e., Over the air and Over the DS, are performed according to whether the AP and the AP belong to a distributed system.
Fig. 3 is a schematic flow chart of cell handover, where the cell handover is based on Over the air, and as shown in fig. 3, the flow of accessing the target cell includes:
s101, the STA sends an Authentication Request (Authentication Request) to the target AP.
The Authentication Request includes FTAA, RSNE [ PMKR0name ], MDE, and FTE [ SNonce, R0KH-ID ]. BSS-based fast transition authentication algorithm (fast BSS transition authentication algorithm). MDE is a Mobile Domain element (Mobile Domain element) that indicates whether the Over the air or the Over the DS is employed. The FTE is a Fast BSS Transition element (Fast BSS Transition element) and includes an integrity protection parameter, a random number (SNonce) generated by the STA, and a right authentication parameter. R0KH-ID represents a pairwise master key R0key holder identifier (PMK) R0key holder identifier).
RSNE represents a powerful Security Network element. The PMK consists of R0 and R1, and PMKR0name represents the name of PMKR0, which is used to compute authentication and encryption keys.
S102, the target AP sends an Authentication Response (Authentication Response) to the STA.
The Authentication Response includes: FTAA, MDE, RSNE [ PMKR0name ], FTE [ Anonce, SNonce, R1KH-ID, R0KH-ID ].
Wherein the target AP is R1KH, the AC managing the AP is R0KH, R0KH-ID represents the identity of the AC, and R1KH-ID represents the identity of the target AP. The channel between R0KH and R1KH to pass keys (keys) can be considered secure. Authentication in response to the authentication request, the FTE has an increase in Anonce and R1KH-ID, Anonce representing the random number generated by the AP, and R1KH-ID representing the identifier of the other holder of the PMK.
The parameters included in the Authentication requests and the Authentication Response are mainly used for Authentication between the STA and the AP and encryption protection in the subsequent data transmission process.
S103, the STA sends a Reassociation Request (Reassociation Request) to the target AP.
The Reassociation Request includes: RSNE [ PMKR1name ], MDE, FTE [ Anonce, SNonce, R1KH-ID, R0KH-ID ].
PMKR1name represents the name of PMKR1 used to compute authentication and encryption keys.
S104, the target STA sends a Reassociation Response (Reassociation Response) to the STA.
The reaction Response includes FTAA, RSNE [ PMKR0name ], MDE, FTE [ Anonce, SNonce, R1KH-ID, R0KH-ID, GTK ].
GTK is a group temporal key.
S101 and S102 are used for link authentication between the AP and the STA, and S103 and S104 are used for association between the AP and the STA.
Fig. 4 is another schematic flow chart of cell handover, where the cell handover is based on the Over the DS, and as shown in fig. 4, the flow of accessing the target cell includes:
s201, the STA sends a fast switching Action Request (FT Action Request) to the target AP.
The FT Action Request comprises identification of STA, identification of target AP, RSNE [ PMKR0name ], MDE and FTE [ SNonce, R0KH-ID ].
S202, the target AP sends a fast transition Action Response (FT Action Response) to the STA.
FT Action Response includes: STA identification, target AP identification, RSNE [ PMKR0name ], MDE, FTE [ Anonce, SNonce, R1KH-ID, R0KH-ID ].
S203, the STA sends a Reassociation Request (Reassociation Request) to the target AP.
The Reassociation Request includes: RSNE [ PMKR1name ], MDE, FTE [ Anonce, SNonce, R1KH-ID, R0KH-ID ].
S204, the target STA sends a Reassociation Response (Reassociation Response) to the STA.
The reaction Response includes FTAA, RSNE [ PMKR0name ], MDE, FTE [ Anonce, SNonce, R1KH-ID, R0KH-ID, GTK ].
In the flows of accessing the target cell shown in fig. 3 and 4, both STAs make a handover decision, and the two access flows are the same, the signaling names are different, the content in the signaling is slightly different, but the signaling functions are the same. The meaning of the parameters for authentication included in the signaling is described with reference to the embodiment shown in fig. 3, and will not be described in detail here.
On one hand, cell switching judgment is carried out by the STA, so that a ping-pong effect is easy to generate. On the other hand, in the prior art, measurement of signal quality of a neighboring cell is not supported during service, and a STA performs neighboring cell scanning after the signal quality of a serving cell is poor, which may cause service interruption.
Particularly, when the terminal device is in a communication scene such as road traffic, rail traffic, etc., for example, a user in a high-speed train running at a high speed, the terminal device such as a mobile phone used by the user is in a high-speed moving state, so that the terminal device may be frequently switched between cells, and the high-speed moving relatively reduces the time reserved for the terminal device to switch the cells, whereas the switching manner in the prior art obviously cannot meet the requirement of the high-speed mobile terminal device on the switching delay.
In order to solve the problems in the prior art, embodiments of the present application provide a cell handover method, where a network device makes a handover decision, and the network device can ensure that a terminal device does not have ping-pong handover through an algorithm. After the source network device determines to switch the terminal device to the target network device, the source network device sends authentication information required by the switching of the terminal device to the target network device, so that empty signaling between the terminal device and the target network device is reduced, switching time can be reduced while the empty signaling is reduced, and switching delay is shortened.
Fig. 5 is a flowchart of a cell switching method provided in an embodiment of the present application, where a switching process of a WIFI system is taken as an example in the present embodiment, and correspondingly, a network device is an AP, as shown in fig. 5, the method provided in the present embodiment includes the following steps:
s301, the first AP determines to switch the accessed STA to the second AP.
The second AP is an adjacent area of the first AP, the first AP is a source AP of the STA, the second AP is a target AP of the STA, the source AP is an AP which the STA is currently accessed to, and the target AP is an AP which the STA is about to switch to the past. In this embodiment, the first AP makes a cell handover decision.
In an exemplary manner, a first AP receives a neighbor cell measurement result of the first AP sent by an STA, and the first AP determines to switch the STA to a second AP according to the neighbor cell measurement result. The first AP may have one or more neighboring cells, and the neighboring cell measurement result of the first AP includes an identifier of the neighboring cell and a Signal quality of the neighboring cell, where the Signal quality of the neighboring cell may be characterized by Reference Signal Receiving Power (RSRP).
Optionally, the RSRP of the neighboring cell is obtained by the STA through smooth filtering, so that the RSRP of the neighboring cell is ensured not to change suddenly.
In other embodiments of the present application, the first AP may also determine whether to perform cell handover based on the neighbor cell measurement result and other parameters, which is not limited in this embodiment.
S302, the first AP sends the capability information of the STA and first authentication information to the second AP, wherein the first authentication information is used for the second AP to carry out link authentication on the STA.
Optionally, the capability information (capcapability) of the STA includes a MAC address of the STA, and the capability information of the STA may further include a power class of the STA, a supported frequency band, and the like, which is not limited in this embodiment.
Optionally, the first Authentication information includes all or part of the Authentication parameters used for Authentication in the Authentication Request in fig. 3, or the first Authentication information includes all or part of the Authentication parameters used for Authentication in the FT Action Request in fig. 4.
Illustratively, the first authentication information only includes an authentication random number (SNonce) in the FT Action Request, and the second AP may acquire the authentication parameters except the authentication random number in the FT Action Request in other manners. For example, the authentication parameter R0KH-ID may be carried in the first authentication information and sent by the first AP to the second AP, or may be pre-configured in the second AP, or the second AP acquires the R0KH-ID from the third party device after receiving the first authentication information.
The authentication random number in the first authentication information is generated by the first AP and sent to the second AP, whereas in the prior art, the authentication random number is generated by the STA, and the first AP serves as a proxy to generate the authentication random number instead of the STA.
It is to be understood that the parameters in the first authentication information may be used for other purposes besides link authentication, for example, the parameters may be used for key calculation, and the calculated key is used for encryption protection of data communication between the STA and the second AP.
In this embodiment, the capability information and the first authentication information of the STA are sent by the first AP to the second AP, and in the prior art, the capability information and the first authentication information of the STA are usually sent by the STA to the second AP.
The capability information of the STA and the first authentication information may be sent to the second AP through one signaling or one message, or may be sent to the second AP through multiple signaling or multiple messages, which is not limited in this embodiment. Illustratively, the capability information of the STA and the first authentication information are carried in a first Handover command, which is used to request the second AP to Handover the STA to the second AP, and the first Handover command may be, but is not limited to, a Handover command.
S303, the first AP receives access permission information from the second AP, where the access permission information is used to instruct the second AP to allow the STA to access the second AP.
And after receiving the STA capacity information and the first authentication information sent by the first AP, the second AP decides whether to allow the STA to access the second AP according to the STA capacity information, the first authentication information and the own strategy. Illustratively, the capability information and the first authentication information of the STA both satisfy the handoff requirement, but the second AP may refuse the STA access if the current load of the second AP is large, and allow the STA access if the current load of the second AP is small. Or, the second AP determines, according to the access information of the STA stored by itself, that the interval between the access time of the STA accessing the second AP last time and the current time is smaller, for example, the interval is smaller than the first interval, the STA is rejected to access, and the interval is greater than or equal to the first interval, the STA is allowed to access.
The second AP generates access permission information, where the access permission information is used to indicate whether the STA is allowed to access the second AP or not, and if the access permission information is used to indicate that the STA is allowed to access, step S304 is executed, and if the access permission information is used to indicate that the STA is not allowed to access, the handover procedure is ended.
Optionally, the second AP may carry the access permission information in the first Handover command Response and send the access permission information to the first AP, where the first Handover command Response is a Handover command Response when the first Handover command is a Handover command.
Optionally, the first handover command response further includes capability information of the second AP. When the first handover command response does not include the capability information of the second AP, the first AP may acquire the capability information of the second AP in other manners.
The two APs perform information interaction through a controlled Wireless Access point And a configuration Protocol (CAPWAP), And a first switching command response between the first AP And the second AP are used as payload carrying of a CAPWAP frame.
S304, the first AP sends a second switching command to the STA.
And under the condition that the second AP allows the STA to access, the first AP sends a second switching command to the STA. The second handover command is used for instructing the STA to handover to the second AP, the second handover command includes second authentication information, the second authentication information includes an authentication random number, and the authentication random number included in the second authentication information is the same as the authentication random number included in the first authentication information. The second authentication information may be used for key calculation for encryption between the STA and the second AP.
Optionally, the second handover command further includes capability information of the second AP.
Alternatively, the second handover command may be a BSS Transition Management Request (BSS Transition Management Request).
S305, the first AP receives a second handover command response from the STA, where the second handover command response is used to indicate that the STA is ready for handover.
And after receiving the second switching command, the STA determines whether to access the second AP according to the second switching command.
When the second switch command is a BSS transmission Management Request, the second switch command Response is a BSS transmission Management Response).
S306, the first AP sends a status transfer (status transfer) command to the second AP, where the status transfer command is used to indicate that the STA is ready for handoff.
And when the second switching command indicates that the STA is ready for switching, the first AP sends a state switching command to the second AP, the state switching command is used for informing the STA that the switching preparation is ready for switching, the second AP sends a first message to the STA after receiving the state switching command, the first message is used for indicating that the link authentication between the second AP and the STA is successful, and the STA associates with the second AP after receiving the first message to complete the cell switching.
In this embodiment, a first AP determines to switch an accessed STA to a second AP, the second AP is an adjacent cell of the first AP, the first AP sends, to the second AP, capability information of the STA and first authentication information, the first authentication information is used for the second AP to perform link authentication on the STA, the first AP receives access permission information from the second AP, the access permission information is used to indicate that the STA is allowed to access the second AP, the first AP sends, to the STA, a second handover command and receives, from the STA, a second handover command response, when the second handover command response indicates that the STA is ready to be handed over, the first AP sends, to the second AP, a state transition command, the state transition command is used to indicate that the STA is ready to be handed over. In the method, the first AP is used for carrying out cell switching judgment, so that ping-pong switching can be avoided, and the first AP is used as a proxy of the STA, so that authentication information for link authentication can be generated and sent to the second AP and the STA, so that an air interface signaling for sending the authentication information to the second AP by the STA is saved, and air interface time delay during switching is further shortened.
Especially, when the STA is in a high-speed mobile scene, for example, a rail transit scene, the method of the embodiment of the present application may reduce the air interface delay for STA switching, so that the STA may quickly switch to the target AP, and it is ensured that a service data packet of the STA is not lost.
On the basis of the first embodiment, fig. 6 is a signaling flowchart of a cell handover method provided in the second embodiment of the present application, and this embodiment still uses a WIFI system as an example, as shown in fig. 6, the method provided in this embodiment includes the following steps:
s401, the STA carries out neighbor measurement.
And the STA carries out neighbor cell measurement according to the neighbor cell measurement configuration sent by the first AP, wherein the neighbor cell measurement configuration is used for configuring the neighbor cell of the first AP and the measurement resources of the neighbor cell. The neighbor measurement configuration may be carried by the first AP in an association response (association response) frame or a reassociation response (reassociation response) frame and sent to the STA.
The neighbor cell measurement configuration is carried by the association response or the re-association response in the access process, a special signaling is not needed to carry the neighbor cell measurement configuration, network resources are saved, the neighbor cell measurement can be started after the terminal is accessed, and a special starting indication is not needed.
The association response and the reassociation response include a Vendor Specific (Vendor Specific) domain, and the neighbor measurement configuration may be carried in the Vendor Specific domain.
Fig. 7 is a diagram illustrating a provider Specific Content (Vendor Specific Content) including a Content identification (Content ID), a Length (Length), and a Vendor Specific field (Vendor Specific field) as shown in fig. 7. The Content ID and Length each occupy 8 bits (bit), and the Length of the Vendor Specific field is variable.
The Vendor Specific field includes the following parameters: offset value (Offset), carrier coefficient k, inter-period (rptingerval), neighbor count M, BSSID, operation Class (Operating Class), Channel Number (Channel Number), Beacon frame Offset (Beacon Offset), and Padding (Padding). Wherein, BSSID, Operating Class, Channel Number and Beacon offset are parameters of a neighbor cell, and the Vendor Specific field comprises parameters of M neighbor cells.
The meaning, value, length (i.e. the number of occupied bits) and unit of each parameter in the Vendor Specific content are shown in table one.
Watch 1
Figure PCTCN2020080143-APPB-000001
In this embodiment, the STA may determine the signal quality of the neighboring cell based on the smooth filtering, so that the neighboring cell configuration information includes a filtering factor k. The Operating Class and the Channel Number have a corresponding relation with the frequency point, the STA can determine the measuring frequency point of the adjacent region according to the corresponding relation, and can determine the measuring time of the adjacent region according to the Beacon offset.
In the prior art, neighbor cell measurement cannot be usually performed during service of an STA, and neighbor cell scanning is generally performed after the signal quality of a serving cell is poor. In the embodiment of the present application, the AP configures measurement time for the STA, and the STA performs measurement according to the measurement time, so that the AP may perform neighbor cell measurement during service.
After the STA starts a measurement process, measuring the signal quality Ms of the cell and the signal quality M of the adjacent cell n And performing smoothing filtering processing. Optionally, the filter formula is F n =(1-a)*F n-1 +a·M n 。F n Representing the signal quality (i.e. measurement) of the n-th neighbor, F n-1 Denotes the neighbor signal quality, M, of the (n-1) th order n Denotes the nth instantaneous neighbor signal quality, which is the signal quality actually measured, and a is 1/2 (k/4) And k is a filter factor.
In this embodiment, the STA performs smooth filtering on the measured instantaneous neighboring cell signal quality, so that the neighboring cell signal quality does not undergo a jump-type sudden change, thereby avoiding ping-pong handover.
S402, the STA sends the neighbor cell measurement result to the first AP.
If the measurement result of a certain neighboring cell meets the reporting condition, the measurement result of the neighboring cell is reported, illustratively, the reporting condition is Ms-M n >offset, wherein the signal quality Ms of the local cell and the signal quality M of the adjacent cell n Are instantaneous measurements and the neighbor signal quality included in the neighbor measurement is the filtered signal quality.
The Neighbor Measurement result may be carried in a Radio Measurement action frame (Radio Measurement action), the Radio Measurement action frame includes a Neighbor Measurement Report (Neighbor Measurement Report) field, and the Neighbor Measurement result may be carried in the Neighbor Measurement Report field.
The value and description (description) of the Radio Measurement action field in the Radio Measurement action frame are shown in table two.
Watch two
Figure PCTCN2020080143-APPB-000002
The content of the neighbor cell measurement reporting field is shown in fig. 8, and the neighbor cell measurement reporting field includes: category (Category), handover measurement reporting and handover measurement reporting units, wherein the handover measurement reporting unit includes the number M of reported cells, the RSRP of the cell, the BSSID of the neighboring cell and the RSRP of the neighboring cell. The switching measurement reporting unit comprises BSSIDs and RSRP of M adjacent cells, wherein the RSRP is the signal quality of the cells.
If the neighboring cell of the first AP is updated, the first AP may send Neighbor Measurement Update (Neighbor Measurement Update) information to the STA, where the Neighbor Measurement Update information is used to Update the neighboring cell of the first AP.
Optionally, the neighbor cell Measurement update information is carried in a Radio Measurement Request (Radio Measurement Request) frame. Optionally, the radio measurement request frame includes a neighbor measurement update field, and the neighbor measurement update information is carried in the neighbor measurement update field.
Optionally, the Radio Measurement Request further includes a Neighbor Measurement Stop (Neighbor Measurement Stop) field and/or a Measurement pause (Measurement pause) indication, where the Neighbor Measurement Stop field carries Neighbor Measurement Stop information, and the Neighbor Measurement Stop information is used to indicate that the Measurement of the Neighbor cell is stopped. The measurement pause indication does not carry out the adjacent cell measurement and report the measurement result within the set time.
Table three is a schematic diagram of Measurement type (Measurement type) values included in the Radio Measurement Request.
Watch III
Name (R) Type of measurement
Basic
0
CCA 1
…… ……
Reservation 17-252
Neighbor measurement update 253
Neighbor measurement stop 254
Measurement suspension 255
Fig. 9 is a schematic diagram of a Radio Measurement Request frame structure, and as shown in fig. 9, Flag represents an update indication of a neighboring cell, where a value of the Flag may be a first preset value or a second preset value, when the value of the Flag is the first preset value, a newly added neighboring cell is represented, and when the value of the Flag is the second preset value, a deletion of the neighboring cell is represented. Optionally, the first preset value is 1, and the second preset value is 0, or the first preset value is true and the second preset value is false, and of course, the first preset value and the second preset value may also be other values, which are not listed here.
In fig. 9, the value of the first flag is 1, M cells after the first flag are newly added neighboring cells, and the number M of the cells is the configuration information of the M cells in turn, where the configuration information of each cell includes BSSID, operation level, channel number, and beacon frame offset. And the value of the second flag is 0, N cells behind the second flag are deleted cells, and BSSIDs of the N cells are sequentially arranged after the number N of the cells.
And S403, the first AP judges the cell switching.
And the first AP determines to switch the STA to the second AP according to the adjacent cell measurement result.
S404, the first AP sends a first switching command to the second AP.
The first handover command includes capability information of the STA and first authentication information, the first authentication information is used for indicating the second AP to perform link authentication on the STA, and the first authentication information includes an authentication random number generated by the first AP.
S405, the second AP sends a first switching command response to the first AP.
The first handover command response includes access permission information indicating whether the STA is allowed or not allowed to access the second AP.
Optionally, the first handover command response further includes capability information of the second AP.
S406, the first AP sends a second handover command to the STA.
The second switching command is used for instructing the STA to switch to the second AP, and the second switching command includes second authentication information, where the second authentication information includes an authentication random number generated by the first AP.
Optionally, the second switching command further includes capability information of the second AP, and the capability information of the second AP included in the second switching command may be sent by the second AP through the first switching command response, or may be acquired by the first AP through another method.
S407, the STA sends a second handover command response to the first AP.
And after receiving the second switching command, if the STA determines to switch to the second AP, the STA sends a second switching command response to the first AP, wherein the second switching command response is used for indicating that the STA is ready for switching. Correspondingly, after the STA sends the second switching command response, the STA waits for the first unicast message of the second AP to the STA according to the channel number of the second AP. If the second switching command response indicates that the STA is not ready for switching, the switching process is ended, and the STA starts the initial access process.
Optionally, if the STA determines not to switch to the second AP, the second handover command response sent by the STA to the first AP is used to indicate that the STA does not prepare for handover, or the STA does not send the second handover command response to the first AP, and after the first AP sends the second handover command to the STA, if the second handover command response is not received within the preset time, it is determined that the STA does not prepare for handover.
S408, the first AP sends a state transition command to the second AP.
And when the second switching command response indicates that the STA is ready for switching, the first AP sends a state switching command to the second AP, wherein the state switching command is used for indicating that the STA is ready for switching.
S409, the second AP sends a first message to the STA.
The first message is used for indicating that the link authentication between the second AP and the STA is successful, the first message is unicast by the second AP to the STA, and the first message may be an FT Action Response or an authentication Response. The specific message of the first message may be different in different communication systems. Through the steps, the second AP and the STA finish link authentication, and after the link authentication is successful, the second AP and the STA carry out association.
S410, the STA sends a re-association request to the second AP.
S411, the second AP sends a reassociation response to the STA.
In this embodiment, after the first AP determines to switch the STA to the second AP, the authentication information required for authenticating the second AP is sent to the second AP through the channel between the first AP and the second AP, and the STA does not need to send the authentication information to the second AP, so that an air interface signaling of the STA is saved, and an air interface delay in the switching process is shortened.
In the cell switching process of this embodiment, the interaction time of 3 subframes can be saved, and if the duration of each subframe is 3ms, the air interface delay of 6ms can be shortened.
Fig. 10 is a signaling flow chart of a cell switching method provided in the third embodiment of the present application, where in this embodiment, after S406, that is, after the first AP sends the second switching command to the STA, data forwarding (data forwarding) of the STA is performed between the first AP and the second AP, so as to ensure that downlink data of the STA is not lost in the switching flow.
Optionally, in this embodiment, after the STA accesses the second AP, path switching may be performed between the first AP and the second AP.
In this embodiment, the DS switching process is taken as an example for description, and as shown in fig. 10, the method provided in this embodiment includes the following steps.
S501, the STA carries out neighbor cell measurement.
S502, the STA sends a measurement report to the first AP.
The measurement report includes neighbor measurement results.
S503, the first AP judges the cell switching.
And the first AP determines to switch the STA to the second AP according to the adjacent cell measurement result.
S504, the first AP sends a switching request (Handover Commend) to the second AP.
The Handover Commend is a first switching command used for requesting the STA to be switched to the second AP, and the Handover Commend comprises message contents of the target AP which the STA needs to send in the FT Action Request message. Illustratively, the STA capability information and the authentication random number are included in the Handover Commend.
S505, the second AP sends a Handover request Response (Handover command Response) to the first AP.
The Handover command Response is the first Handover command Response, and the Handover command Response includes access permission information, and optionally, may further include capability information of the second AP.
S506, the first AP sends a BSS Transition Management Request (BSS Transition Management Request) to the STA.
The BSS transmission Management Request is a second switching command, and is used to instruct the STA to switch to the second AP, where the BSS transmission Management Request includes the authentication random number, and optionally, further includes capability information of the second AP. BSS Transmission Management Request is regarded as Handover Request.
S507, the first AP and the second AP carry out data forwarding of the STA.
The data forwarding is to send the downlink data which is not sent to the STA by the first AP to the second AP, so that after the STA is accessed to the second AP, the downlink data can be sent to the STA by the second AP, and the downlink data of the STA cannot be lost in the cell switching process.
It can be understood that fig. 10 is only a schematic diagram, and one message or multiple messages may be interactively completed in the data forwarding process, which is not limited in this embodiment.
S508, the STA sends a BSS Transition Management Response (BSS Transition Management Response) to the first AP.
The BSS transmission Management Response serves as a Handover Response, the BSS transmission Management Response is a second Handover command Response, and the BSS transmission Management Request and the BSS transmission Management Response are the Handover signaling in the 802.11v protocol.
S509, the first AP sends a state transition command to the second AP.
When BSS Transition Management Response indicates that the STA is ready for switching, the first AP sends a state Transition command to the second AP, and the state Transition command is used for the STA to be ready for switching. If BSS Transmission Management Response indicates that STA is not ready for switching, STA starts initial access flow.
S510, the second AP sends a fast transition Action Response (FT Action Response) to the STA.
After the second AP determines that the STA is ready for switching, an FT Action Response is sent to the STA, the FT Action Response is a first message sent to the STA by the second AP, after the STA sends a BSS transfer Management Response to the first AP, if the BSS transfer Management Response indicates that the STA has made switching preparation, the STA waits for the FT Action Response according to the channel number of the second AP, and the FT Action Response indicates that the link authentication between the second AP and the STA is successful.
S511, the STA sends a Reassociation Request (Reassociation Request) to the second AP.
S512, the second AP sends a Reassociation Response (Reassociation Response) to the STA.
The contents of the FT Action Response, the responsiveness Request, and the responsiveness Response message are the same as those defined in the existing standard, and are not described herein again.
The second AP completes link authentication with the STA according to the BSS transmission Management Request sent by the first AP in step S506 and the FT Action Response sent by the second AP in step S510. After the link authentication is successful, the STA and the second AP complete association through a re-association process, the switching process is finished, the STA and the second AP can communicate with each other, at the moment, the second AP can send forward data of the STA to the STA, and therefore the fact that downlink data of the STA cannot be lost in the switching process is guaranteed.
S513, the second AP sends a Path switch command (Traffic Path Handover) to the first AP.
The path switching command is used for indicating the STA to update the routing information, the second AP sends the path switching command to the first AP after the STA is successfully switched, and the first AP updates the routing information of the STA in the local area according to the path switching command.
S514, the first AP sends a Path switch Response (Traffic Path Handover Response) to the second AP.
The response of the path switching command is used to indicate success or failure of the routing information update.
S515, the second AP sends a user context release command (UE context release) to the first AP.
And the user context release command is used for indicating the first AP to release the stored user context of the STA, the user context release command is sent by the second AP after receiving a path switching response indicating that the routing information is updated successfully, and the first AP releases the user context of the STA according to the release command.
It should be clear that steps S513 and S514 are optional steps, and the second AP may also directly send the user context release command to the first AP after determining that the STA switch is successful.
In this embodiment, after the first AP determines to switch the STA to the second AP, the authentication information required for link authentication of the second AP is sent to the second AP through the Handover command message, and the STA does not need to send the authentication information to the second AP through the FT Action Request after receiving the switching command sent by the first AP, so that an air interface signaling of the STA is saved, and an air interface delay in the switching process is shortened. Because the STA does not need to send an FT Action Request to the second AP, the first unicast message between the second AP and the STA is an FT Action Response.
In the cell switching process of this embodiment, the interaction time of 3 subframes can be saved at most, and assuming that after the first AP decides to perform cell switching, the first AP does not send authentication information to the second AP, but the STA sends authentication information to the second AP, the switching time is: subframe length + Q + X + Y + Z + W + P.
Q: the source AP receives the Handover Response to the time the target AP can send msg1 (i.e., the first message).
Wherein, msg1 is Uplink OFDMA-based Random Access (UORA) Tirgger. The UORA trigger is an uplink scheduling frame and is used for indicating contention resource information adopted by the unassociated STA access.
X: the time from the target AP air interface receiving the Probe Request (Probe Request) to the time of being able to send the Probe response (Probe response) to the air interface.
Wherein, the Probe Request is used for the STA to actively scan and discover the wireless network, if the switching optimization is not carried out, the STA sends the Probe Request to the target AP after receiving the switching command sent by the source AP, and the target AP returns the Probe response after receiving the Probe Request
Y: the STA receives the Probe Response to the time when the FT Action Request can be sent (the target AP is considered to send the Probe Response and then can send the UORA trigger), and if the STA has enough capability, Y can be 0.
Z: and the target AP receives the FT Action Request and sends the FT Action Request to an air interface FT Action Response.
W: the STA receives the FT Action Response and the time when the STA can send the Response Request (the target AP is considered to send the UORA trigger at any time after sending the FT Action Response), and if the STA has enough capability, the W can be 0.
P: the target AP receives the Response Request until a time that can be issued to the air interface Response.
S: the source AP receives the Handover Response to the time that the target AP can send the FT Action Response, and if the AP capacity is enough, the S can be 0.
Through the optimization of the embodiment of the application, the switching time can be shortened to 4 × subframe length + S + W + P, and the shortening time of 4 × subframe length + W + P relative to 7 × subframe length + Q + X + Y + Z + W + P is 3 × subframe length + Q + X + Y + Z-S.
In this embodiment, the Over the DS switching process is taken as an example for description, and of course, the above switching process is also applicable to the Over the air, and when the switching process is based on the Over the air, the switching process is the same as the switching process, but the message name and the content are slightly different, but the message function is the same, and the detailed description is omitted in this application.
Fig. 11 is a schematic structural diagram of a first network device according to a fourth embodiment of the present application, and as shown in fig. 11, the first network device 100 according to this embodiment includes: a determining module 11, configured to determine to switch a terminal device from a first network device to a second network device; a sending module 12, configured to send capability information of the terminal device and first authentication information to the second network device, where the first authentication information is used for the second network device to perform link authentication on the terminal device; a receiving module 13, configured to receive access permission information from the second network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device; the sending module 12 is further configured to send a second handover command to the terminal device, where the second handover command is used to instruct the terminal device to switch to the second network device, and the second handover command includes second authentication information; the receiving module 13 is further configured to receive a second handover command response from the terminal device, where the second handover command response is used to indicate that the terminal device is ready for handover; the sending module 12 is further configured to send a state transition command to the second network device, where the state transition command is used to indicate that the terminal device is ready for handover.
In one exemplary approach, the first authentication information includes an authentication nonce, the authentication nonce being generated by the first network device.
In an exemplary manner, the second authentication information includes the authentication nonce.
In an exemplary manner, the sending module 12 sends the capability information of the terminal device and the first authentication information to the second network device, and includes: sending a first switching command to the second network equipment, wherein the first switching command comprises the capability information of the terminal equipment and first authentication information; the receiving module 13 receives access permission information from the second network device, including: receiving a first handover command response from the second network device, the first handover command response including the access permission information.
In an exemplary manner, the receiving module 13 is further configured to receive a path switching command from the second network device after the terminal device accesses the second network device, where the path switching command is used to instruct the terminal device to update the routing information; the sending module 12 is further configured to send a path switching command response to the second network device, where the path switching command response is used to indicate that the routing information update is successful or failed.
In an exemplary manner, the method further comprises: and the data forwarding module is used for performing data forwarding of the terminal equipment with the second network equipment.
In an exemplary manner, the receiving module 13 is further configured to: receiving a neighbor cell measurement result of the first network device from the terminal device; the determining module 11 is specifically configured to: and determining to switch the terminal equipment to the second network equipment according to the neighbor cell measurement result.
The first network device of this embodiment may be configured to execute the method steps executed by the first network device or the first AP in the foregoing method embodiments, and specific implementation manners and technical effects are similar and will not be described herein again.
Fig. 12 is a schematic structural diagram of a second network device according to a fifth embodiment of the present application, and as shown in fig. 12, a second network device 200 according to this embodiment includes: a receiving module 21, configured to receive, from a first network device, capability information of a terminal device and first authentication information, where the terminal device has access to the first network device, and the first authentication information is used for performing link authentication on the terminal device by the second network device; a sending module 22, configured to send access permission information to the first network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device; the receiving module 21 is further configured to receive a state transition command from the first network device, where the state transition command is used to indicate that the terminal device is ready for handover; the sending module 22 is further configured to send a first message to the terminal device, where the first message is used to indicate that the link authentication between the second network device and the terminal device is successful; an associating module 23, configured to associate the second network device with the terminal device.
In an exemplary manner, the association module 23 is specifically configured to: receiving a re-association request from the terminal device; and sending a re-association response to the terminal equipment.
In one exemplary approach, the first authentication information includes an authentication nonce, the authentication nonce being generated by the first network device.
In an exemplary manner, the receiving module 21 receives the capability information and the first authentication information of the terminal device from the first network device, and includes: receiving a handover request from the first network device, wherein the handover request comprises the capability information of the terminal device and the first authentication information; the sending module 22 sends the access permission information to the first network device, including: and sending a switching request response to the first network equipment, wherein the switching request response comprises the access permission information.
In an exemplary manner, the first message is an authentication response or a fast transition action response.
In an exemplary manner, the sending module 22 is further configured to send a path switching command to the first network device after the second network device is associated with the terminal device, where the path switching command is used to instruct the terminal device to update the routing information; the receiving module 21 is further configured to receive a path switching command response from the first network device, where the path switching command response is used to indicate that the routing information update is successful or failed.
In an exemplary manner, the method further comprises: and the data forwarding module is used for forwarding the data of the terminal equipment with the first network equipment.
The second network device of this embodiment may be configured to execute the method steps executed by the second network device or the second AP in the foregoing method embodiment, and the specific implementation manner and the technical effect are similar, and are not described herein again.
Fig. 13 is a schematic structural diagram of a terminal device according to a sixth embodiment of the present application, and as shown in fig. 13, a terminal device 300 according to this embodiment includes: a receiving module 31, configured to receive a second handover command from a first network device, where the second handover command is used to instruct the terminal device to handover to a second network device, and the second handover command includes second authentication information; a sending module 32, configured to send a second handover command response to the first network device, where the second handover command response is used to indicate that the terminal device is ready for handover; the receiving module 31 is further configured to receive a first message sent by the second network device, where the first message is used to indicate that the link authentication between the second network device and the terminal device is successful; an associating module 33, configured to associate the terminal device with the second network device in response to the first message.
In an exemplary manner, the association module 33 is specifically configured to: sending an association request to the second network device; receiving an association response from the second network device.
In an exemplary manner, the first message is an authentication response or a fast transition action response.
In an exemplary manner, the method further comprises: the measurement module is used for carrying out neighbor cell measurement according to the neighbor cell measurement configuration; the sending module 32 is further configured to send a neighboring cell measurement result to the first network device.
In an exemplary manner, the receiving module 31 is further configured to: receiving the neighbor cell measurement configuration from the first network device, where the neighbor cell measurement configuration is used to configure a neighbor cell of the first network device and measurement resources of the neighbor cell.
In an exemplary manner, the sending module 32 sends the neighbor cell measurement result to the first network device, including: and sending a wireless measurement action frame to the first network equipment, wherein the wireless measurement action frame comprises the neighbor cell measurement reporting field, and the neighbor cell measurement result is carried in the neighbor cell measurement reporting field.
In an exemplary manner, the receiving module 31 receives the neighbor cell measurement configuration from the first network device, including: receiving an association response or a re-association response from the first network device, where the association response or the re-association response includes the neighbor cell measurement configuration.
In an exemplary manner, the association response or the re-association response includes a provider specific domain, and the neighbor cell measurement configuration is carried in the provider specific domain.
In an exemplary manner, the receiving module 31 is further configured to: and receiving neighbor cell measurement update information from the first network device, wherein the neighbor cell measurement update information is used for updating a neighbor cell of the first network device.
In an exemplary manner, the receiving module 31 receives neighbor cell measurement update information from the first network device, and includes: and receiving a wireless measurement request frame from the first network device, wherein the wireless measurement request frame comprises a neighbor cell measurement update field, and the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
In an exemplary manner, the radio measurement request frame further includes a neighbor cell measurement stop field, where the neighbor cell measurement stop field carries neighbor cell measurement stop information, and the neighbor cell measurement stop information is used to indicate that measurement of a neighbor cell is stopped.
The terminal device of this embodiment may be configured to execute the method steps executed by the terminal device in the foregoing method embodiments, and the specific implementation manner and the technical effect are similar, and are not described herein again.
Fig. 14 is a schematic structural diagram of a first network device according to a seventh embodiment of the present application, and as shown in fig. 14, a first network device 400 according to this embodiment includes: the processor 41, the memory 42, and the transceiver 43, where the memory 42 is configured to store instructions, the memory 42 and the transceiver 43 are connected to and communicate with the processor 41 through a bus, the transceiver 43 is configured to send and receive data, and the processor 41 is configured to execute the instructions stored in the memory 42, so that the first network device 400 executes the method steps executed by the first network device in the method embodiment of the present application, and specific implementation and technical effects are similar, and are not described herein again.
An eighth embodiment of the present application provides a second network device, where the structure of the second network device refers to the structure of the first network device shown in fig. 14, the second network device includes a processor, a memory, and a transceiver, the memory is used to store instructions, the transceiver is used to communicate with other devices, and the processor is used to execute the instructions stored in the memory, so that the second network device executes the method steps executed by the second network device in the method embodiment of the present application, and a specific implementation manner and a technical effect are similar, and are not described again here.
A ninth embodiment of the present application provides a terminal device, where the structure of the terminal device refers to the structure of the first network device shown in fig. 14, the terminal device includes a processor, a memory, and a transceiver, the memory is used to store instructions, the transceiver is used to communicate with other devices, and the processor is used to execute the instructions stored in the memory, so that the terminal device executes the method steps executed by the terminal device in the embodiment of the present application, and a specific implementation manner and technical effects are similar, and are not described again here.
It is understood that the processor used in the network device or the terminal device in the present application may be a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others.
The bus described herein may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

Claims (54)

  1. A method of cell handover, comprising:
    the first network equipment determines to switch the accessed terminal equipment to the second network equipment;
    the first network device sends the capability information and the first authentication information of the terminal device to the second network device, wherein the first authentication information is used for the second network device to perform link authentication on the terminal device;
    the first network equipment receives access permission information from the second network equipment, wherein the access permission information is used for indicating that the terminal equipment is allowed to access the second network equipment;
    the first network equipment sends a second switching command to the terminal equipment, wherein the second switching command is used for indicating the terminal equipment to be switched to the second network equipment and comprises second authentication information;
    the first network equipment receives a second switching command response from the terminal equipment, wherein the second switching command response is used for indicating that the terminal equipment is ready for switching;
    and the first network equipment sends a state transition command to the second network equipment, wherein the state transition command is used for indicating that the terminal equipment is ready for switching.
  2. The method of claim 1, wherein the first authentication information comprises an authentication nonce, the authentication nonce being generated by the first network device.
  3. The method of claim 2, wherein the second authentication information comprises the authentication nonce.
  4. The method according to any of claims 1-3, wherein the first network device sends the capability information of the terminal device and the first authentication information to the second network device, comprising:
    the first network equipment sends a first switching command to the second network equipment, wherein the first switching command comprises the capability information and the first authentication information of the terminal equipment;
    the first network device receiving access permission information from the second network device, including:
    the first network device receives a first switching command response from the second network device, wherein the first switching command response comprises the access permission information.
  5. The method according to any of claims 1-4, wherein after the terminal device accesses the second network device, further comprising:
    the first network equipment receives a path switching command from the second network equipment, wherein the path switching command is used for indicating the terminal equipment to update the routing information;
    and the first network equipment sends a path switching command response to the second network equipment, wherein the path switching command response is used for indicating that the route information is updated successfully or unsuccessfully.
  6. The method according to any of claims 1-5, wherein after the first network device sends the second handover command to the terminal device, further comprising:
    and the first network equipment and the second network equipment carry out data forwarding of the terminal equipment.
  7. The method of any of claims 1-6, wherein before the first network device determines to handover the accessed terminal device to the second network device, further comprising:
    the first network equipment receives a neighbor cell measurement result of the first network equipment from the terminal equipment;
    the determining, by the first network device, to switch the accessed terminal device to the second network device includes:
    and the first network equipment determines to switch the terminal equipment to the second network equipment according to the neighbor cell measurement result.
  8. A method of cell handover, comprising:
    the method comprises the steps that a second network device receives capability information and first authentication information of a terminal device from a first network device, wherein the terminal device is accessed to the first network device, and the first authentication information is used for link authentication of the terminal device by the second network device;
    the second network device sends access permission information to the first network device, wherein the access permission information is used for indicating that the terminal device is allowed to access the second network device;
    the second network equipment receives a state transition command from the first network equipment, wherein the state transition command is used for indicating that the terminal equipment is ready for switching;
    the second network equipment sends a first message to the terminal equipment, wherein the first message is used for indicating that the link authentication between the second network equipment and the terminal equipment is successful;
    and the second network equipment is associated with the terminal equipment.
  9. The method of claim 8, wherein associating the second network device with the terminal device comprises:
    the second network device receiving a re-association request from the terminal device;
    and the second network equipment sends a re-association response to the terminal equipment.
  10. The method according to claim 8 or 9, wherein the first authentication information comprises an authentication nonce, the authentication nonce being generated by the first network device.
  11. The method according to any of claims 8-10, wherein the second network device receives the capability information and the first authentication information of the terminal device from the first network device, comprising:
    the second network equipment receives a switching request from the first network equipment, wherein the switching request comprises the capability information of the terminal equipment and the first authentication information;
    the second network device sending access permission information to the first network device, including:
    and the second network equipment sends a switching request response to the first network equipment, wherein the switching request response comprises the access permission information.
  12. The method according to any of claims 8-11, wherein the first message is an authentication response or a fast transition action response.
  13. The method according to any of claims 8-12, wherein after the second network device is associated with the terminal device, further comprising:
    the second network equipment sends a path switching command to the first network equipment, wherein the path switching command is used for indicating the terminal equipment to update the routing information;
    the second network equipment receives a path switching command response from the first network equipment, wherein the path switching command response is used for indicating that the route information is updated successfully or unsuccessfully.
  14. The method according to any of claims 8-13, wherein after the second network device sends the access permission information to the first network device, further comprising:
    and the second network equipment and the first network equipment perform data forwarding of the terminal equipment.
  15. A method of cell handover, comprising:
    the terminal equipment receives a second switching command from the first network equipment, wherein the second switching command is used for indicating the terminal equipment to be switched to the second network equipment and comprises second authentication information;
    the terminal equipment sends a second switching command response to the first network equipment, and the second switching command response is used for indicating that the terminal equipment is ready for switching;
    the terminal device receives a first message sent by the second network device, wherein the first message is used for indicating that the link authentication between the second network device and the terminal device is successful;
    and responding to the first message, and associating the terminal equipment with the second network equipment.
  16. The method of claim 15, wherein associating the terminal device with the second network device comprises:
    the terminal equipment sends an association request to the second network equipment;
    the terminal device receives an association response from the second network device.
  17. The method according to claim 15 or 16, wherein the first message is an authentication response or a fast transition action response.
  18. The method according to any of claims 15-17, wherein before the terminal device receives the second handover command from the first network device, further comprising:
    the terminal equipment carries out neighbor cell measurement according to the neighbor cell measurement configuration;
    and the terminal equipment sends the neighbor cell measurement result to the first network equipment.
  19. The method of claim 18, further comprising:
    and the terminal equipment receives the neighbor cell measurement configuration from the first network equipment, wherein the neighbor cell measurement configuration is used for configuring the neighbor cell of the first network equipment and the measurement resource of the neighbor cell.
  20. The method according to claim 18 or 19, wherein the terminal device sends the neighbor cell measurement result to the first network device, and comprises:
    and the terminal equipment sends a wireless measurement action frame to the first network equipment, wherein the wireless measurement action frame comprises the neighbor cell measurement reporting field, and the neighbor cell measurement result is carried in the neighbor cell measurement reporting field.
  21. The method of claim 19, wherein the terminal device receives the neighbor measurement configuration from the first network device, comprising:
    and the terminal equipment receives an association response or a re-association response from the first network equipment, wherein the association response or the re-association response comprises the neighbor cell measurement configuration.
  22. The method of claim 21, wherein a vendor specific domain is included in the association response or the re-association response, and wherein the neighbor cell measurement configuration is carried in the vendor specific domain.
  23. The method of any one of claims 18-22, further comprising:
    and the terminal equipment receives neighbor cell measurement updating information from the first network equipment, wherein the neighbor cell measurement updating information is used for updating the neighbor cell of the first network equipment.
  24. The method of claim 23, wherein the terminal device receives the neighbor measurement update information from the first network device, and wherein the method comprises:
    the terminal device receives a wireless measurement request frame from the first network device, wherein the wireless measurement request frame comprises a neighbor cell measurement update field, and the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
  25. The method of claim 24, wherein the radio measurement request frame further includes a neighbor cell measurement stop field, and the neighbor cell measurement stop field carries neighbor cell measurement stop information, and the neighbor cell measurement stop information is used to indicate that the measurement of the neighbor cell is stopped.
  26. A first network device, comprising:
    the terminal equipment switching module is used for switching the terminal equipment from the first network equipment to the second network equipment;
    a sending module, configured to send, to the second network device, capability information of the terminal device and first authentication information, where the first authentication information is used for performing link authentication on the terminal device by the second network device;
    a receiving module, configured to receive access permission information from the second network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device;
    the sending module is further configured to send a second handover command to the terminal device, where the second handover command is used to instruct the terminal device to handover to the second network device, and the second handover command includes second authentication information;
    the receiving module is further configured to receive a second handover command response from the terminal device, where the second handover command response is used to indicate that the terminal device is ready for handover;
    the sending module is further configured to send a state transition command to the second network device, where the state transition command is used to indicate that the terminal device is ready for handover.
  27. The device of claim 26, wherein the first authentication information comprises an authentication nonce, the authentication nonce being generated by the first network device.
  28. The apparatus of claim 27, wherein the second authentication information comprises the authentication nonce.
  29. The apparatus according to any of claims 26-28, wherein the sending module sends the capability information of the terminal device and the first authentication information to the second network device, comprising:
    sending a first switching command to the second network equipment, wherein the first switching command comprises the capability information and the first authentication information of the terminal equipment;
    the receiving module receives access permission information from the second network device, including:
    receiving a first handover command response from the second network device, the first handover command response including the access permission information.
  30. The apparatus according to any of claims 26-29, wherein the receiving module is further configured to receive a path switching command from the second network device after the terminal device accesses the second network device, the path switching command being used to instruct the terminal device to update the routing information;
    the sending module is further configured to send a path switching command response to the second network device, where the path switching command response is used to indicate that the routing information update is successful or failed.
  31. The apparatus of any one of claims 26-30, further comprising:
    and the data forwarding module is used for performing data forwarding of the terminal equipment with the second network equipment.
  32. The apparatus of any one of claims 26-31, wherein the receiving module is further configured to: receiving a neighbor cell measurement result of the first network device from the terminal device;
    the determining module is specifically configured to: and determining to switch the terminal equipment to the second network equipment according to the neighbor cell measurement result.
  33. A second network device, comprising:
    a receiving module, configured to receive, from a first network device, capability information of a terminal device and first authentication information, where the terminal device has access to the first network device, and the first authentication information is used for performing link authentication on the terminal device by a second network device;
    a sending module, configured to send access permission information to the first network device, where the access permission information is used to indicate that the terminal device is allowed to access the second network device;
    the receiving module is further configured to receive a state transition command from the first network device, where the state transition command is used to indicate that the terminal device is ready for handover;
    the sending module is further configured to send a first message to the terminal device, where the first message is used to indicate that the link authentication between the second network device and the terminal device is successful;
    and the association module is used for associating the second network equipment with the terminal equipment.
  34. The device according to claim 33, wherein the association module is specifically configured to:
    receiving a re-association request from the terminal device;
    and sending a re-association response to the terminal equipment.
  35. The device of claim 33 or 34, wherein the first authentication information comprises an authentication nonce, the authentication nonce being generated by the first network device.
  36. The apparatus of any one of claims 33-35, wherein the receiving module receives the capability information and the first authentication information of the terminal device from the first network device, and comprises:
    receiving a handover request from the first network device, wherein the handover request comprises the capability information of the terminal device and the first authentication information;
    the sending module sends access permission information to the first network device, including:
    and sending a switching request response to the first network equipment, wherein the switching request response comprises the access permission information.
  37. The apparatus of any one of claims 33-36, wherein the first message is an authentication response or a fast transition action response.
  38. The device according to any of claims 33-37, wherein the sending module is further configured to send a path switching command to the first network device after the second network device is associated with the terminal device, where the path switching command is used to instruct the terminal device to update routing information;
    the receiving module is further configured to receive a path switching command response from the first network device, where the path switching command response is used to indicate that the routing information update is successful or failed.
  39. The apparatus of any one of claims 33-37, further comprising:
    and the data forwarding module is used for performing data forwarding of the terminal equipment with the first network equipment.
  40. A terminal device, comprising:
    a receiving module, configured to receive a second handover command from a first network device, where the second handover command is used to instruct the terminal device to switch to a second network device, and the second handover command includes second authentication information;
    a sending module, configured to send a second handover command response to the first network device, where the second handover command response is used to indicate that the terminal device is ready for handover;
    the receiving module is further configured to receive a first message sent by the second network device, where the first message is used to indicate that the link authentication between the second network device and the terminal device is successful;
    an association module for associating the terminal device with the second network device in response to the first message.
  41. The device according to claim 40, wherein the association module is specifically configured to:
    sending an association request to the second network device;
    receiving an association response from the second network device.
  42. The apparatus according to claim 40 or 41, wherein the first message is an authentication response or a fast transition action response.
  43. The apparatus of any one of claims 40-42, further comprising:
    the measurement module is used for carrying out neighbor cell measurement according to the neighbor cell measurement configuration;
    the sending module is further configured to send a neighboring cell measurement result to the first network device.
  44. The device of claim 43, wherein the receiving module is further configured to:
    receiving the neighbor cell measurement configuration from the first network device, where the neighbor cell measurement configuration is used to configure a neighbor cell of the first network device and measurement resources of the neighbor cell.
  45. The device of claim 43 or 44, wherein the sending module sends the neighbor cell measurement result to the first network device, and comprises:
    and sending a wireless measurement action frame to the first network equipment, wherein the wireless measurement action frame comprises the neighbor cell measurement reporting field, and the neighbor cell measurement result is carried in the neighbor cell measurement reporting field.
  46. The device of claim 44, wherein the receiving module receives the neighbor measurement configuration from the first network device, comprising:
    receiving an association response or a re-association response from the first network device, where the association response or the re-association response includes the neighbor cell measurement configuration.
  47. The device of claim 46, wherein the association response or re-association response includes a vendor specific domain in which the neighbor cell measurement configuration is carried.
  48. The device of any one of claims 43-47, wherein the receiving module is further configured to:
    and the terminal equipment receives neighbor cell measurement updating information from the first network equipment, wherein the neighbor cell measurement updating information is used for updating a neighbor cell of the first network equipment.
  49. The device of claim 48, wherein the receiving module receives the neighbor measurement update information from the first network device, comprising:
    and receiving a wireless measurement request frame from the first network device, wherein the wireless measurement request frame comprises a neighbor cell measurement update field, and the neighbor cell measurement update information is carried in the neighbor cell measurement update field.
  50. The apparatus of claim 49, wherein the radio measurement request frame further includes a neighbor cell measurement stop field, and the neighbor cell measurement stop field carries neighbor cell measurement stop information, and the neighbor cell measurement stop information is used to indicate that the measurement of the neighbor cell is stopped.
  51. A network device comprising a processor, a memory for storing instructions, and a transceiver for communicating with other devices, the processor being configured to execute the instructions stored in the memory to cause the network device to perform the method of any one of claims 1-7.
  52. A network device comprising a processor, a memory for storing instructions, and a transceiver for communicating with other devices, the processor being configured to execute the instructions stored in the memory to cause the network device to perform the method of any one of claims 8-14.
  53. A terminal device comprising a processor, a memory for storing instructions, and a transceiver for communicating with other devices, the processor being configured to execute the instructions stored in the memory to cause the terminal device to perform the method of any one of claims 15-25.
  54. A chip for application in a terminal device, wherein the chip comprises at least one communication interface, at least one processor, and at least one memory, the memory being configured to store instructions, the communication interface, the memory, and the processor being interconnected by a bus, the processor causing the chip to perform the method according to any one of claims 15-25 by executing the instructions stored in the memory.
CN202080095901.7A 2020-03-19 2020-03-19 Cell switching method and device Pending CN115088304A (en)

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